D-Glucopyranose 1,2,3,6-Tetrabenzoate is used in the synthesis of α-D-Glucosyl Acarbose Impurity, a homolog of Acarbose (A123500) for use in the treatment of chronic diseases such as inflammatory (including allergic) diseases, metastatic cancers and infection by pathogenic agents including bacteria, viruses or parasites. Acarbose impurity F.